From the Trans Inclusion Toolkit referenced in the Guardian article
www.mermaidsuk.org.uk/assets/media/East%20Sussex%20schools%20transgender%20toolkit.pdf
3.3 Feedback from consultation with trans* and gender
questioning young people at Transformers
"Transformers is a trans youth group for trans and gender questioning young people, which is part of Brighton & Hove’s Allsorts Youth Project
When asked what their greatest concerns were as a trans pupil or student in school, young trans people at Transformers all agreed that toilet arrangements were a cause for concern.
All of the young people we spoke to had experience of verbal and occasionally physical abuse when using toilets, both in school and outside of school. Their chief concerns were that if they use a toilet which they deem appropriate to their chosen gender, that they will be read as their birth gender and experience prejudice from other pupils or students. Obviously, they do not feel comfortable using toilets appropriate to their genetic sex for the same reason, and for the simple reason, that these are not the right toilets for them to use.
The general consensus among the young people with whom we spoke was that mixed gender toilets are the ideal solution. Many had experience of using the disabled toilets but felt that this was not appropriate for them, because they either felt that they were using a facility which someone else who actually had a disability could be using and there was a certain resentment among a few young people that their trans* status should be seen as a disability"